To compare with normal rims, the improvements of premium rims are as below.
1. The premium rims are manufactured by better T700 carbon fibers materials with higher resin composite;
2. In aspect of technology, the layer-up system, carbon fibers are cut in angles of 30 degrees and 60 degrees. More complicated process to achieve improvements of stiffness and strength. It performs better impact resistance than normal rims with only one degree of 45;
3. We made a separate mold to layer up the spoke bed wall by carbon fiber. The flatness of rim channel surface significantly improved, which makes the thickness at each spoke hole completely consistent, so that it effectively prevents the carbon loop of spoke hole wall from shifting;
4. Each of rim would be attached with a card showing the flatness and roundness. The flatness and roundness are controlled within 0.3mm, better than normal 0.5mm. It's quite easy to build wheels than normal versions;
5. We enhanced the depth from 16.5mm to 14.5mm (NXT90WD-II to premium NXT90WD-IIX), this small change makes big difference. You don't need any tools at all to run tubeless. It's so easy, just mount tires on rims and pump tires, tubeless setup succeeds.
6. Three years warranty;